Machine fob sawing stone



i i specificationyin whichyr41S JtT'BRUEN-.AND J.lG.ffwILsoN, 0EHAs'rINGs,'NEw`YORK.

Specicati'on of f Letters Patent No. 9, 5 13 dated January l 4, Y 1 853.

` e certain 'Improvements `in Machinery for Sawing Marble and otherStone,s and that the "following isa" full, clear, and exactde- Yscription llthereof,'referenoe being had to the l accompanying drawing,making part of this y. Figurel is aplan; Fig. 2, a side elevation;f-`Ifig. 3, ane'nd elevation; Fig. Vil, a longitudinal verticalvsection of one of the posts; and Fig. A5, a plan of the same.

'I dvThesamefletters indicate like parts in all theifi'gures.

#In 1 our improved machinery for sawing orisa'ws` gare" arranged in areciprocating i 220i frame'or gate which'is guided laterally byworkingjbetweenguide posts, and provided with Wheels V'which run onhorizontal ways which move upY Vand down. in appropriate guides and:sustained byv vertical screws tapped through :their ends, whichscrewsare all geared so as to turn with equal velocity either-in liftingthesaw frame or lettingit downv to Vv feed. f` During the operation ofsawingit is imi 'y soportant-thatthe saw beprope'rly supplied withsand-.andfwater for well knownreasons. 'Ifithe'sawbe-permitted to restconstantly on the bottom of the kerf, the grains of'sand cannot 'getbctween'the edge of the vjfsrsaw' and the stone for that reason saws forthi'spurposewhether workedby hand or by jpowcr,-have always heretoforebeen liftedv up at the end of each stroke that the sand might becarried`under-the edge of the blade .s0 that theweight of the saw blade &c.,bearingon thegrains' of 'sand might cause their sharpvangles' tobreakdown the texture of the stone. In saws worked by power-there are seriousobjections to the lifting of the saw frame'and its `appendages at theend of its stroke. The crank shaft, from which the reciprocatingmotion'isderived, being stationary, and the saw having an up and downrange of motion equal to the thickness of stone to be cut through, itmust follow that the range of the reciprocating motion will be greaterwhen the plane of the sawframe coincides with the axis of the crankshaft, than when above or below it, so that the lifting action mustvary, lifting higher at one time than another. We have disclinedprojections.

covered that' a much' better effectis produced if the sand be introducedunder'the sawcat'the middle offits stroke-than when introduced; at theendffor'the reason'that' the grains of sand `arecarried in onedirectionhalf the length of thestroke, and then back in the opposite direction,Ipresenting-'on the ret-urnV motion, opposite anglesto act on .the stone,while on the old plan -thef gralns of sand act ,thewhole lengthof`v thestroke in the same direction, and arethen discharged And what is-'ofgreat importance in our plan the-freshy grains-of sand i fwith theirsharp `angles lare Inadeto' act onf.`

the stone when the saw is at its maximum velocity, while inthe oldplan-thisl takes Lplace when the saw has its minimum motion. marble andotherkinds of stone the blades lifting the sawlframe at or sufficientlynears' ithe middle of its range of motion to effect the contemplatedpurpose by means of in- The nature of our invention consists in clinedprojections on the ways over which place when the wheels strike :thesaid in- In the accompanying drawing a represents the frame and?) thecorner posts or standards thereof which are 'made with morin the bottomof the mortise, and theupper` end is tted to turn in an appropriate boxinthe top of the post, the upper end of the said screw shaft extendingup above the post and there provided witha bevel cog wheel f. Thefour'screwshafts are mounted alike and the'four wheels are of the samediameter. On one end of the frame there is a shaft g with fast and loosepulleys h, to receive a driving strap from some first mover. At the endit is provided with beveled pinions z', z', which engage two of thebevel wheels on the twoscrew shafts at that end of the frame. There isthen another shaft y' with two bevel pinions lo, la,

'to communicate motion from one of these to give the feed .motion thereis a double arm lever a, that vibrates on the shaft g, one arm of whichis connected with a connecting rod from an eccentric on some suitabledriving shaft by means of a bolt p passing .through a slot g, so thatthe said connection can be adjusted at pleasure'to` any distance fromthe axis of vibration to vary the feed. The other arm of the said levercarries a jointed hand or pawl 1, the lsurface. of which when the leverturns inV theA direction of the arrow bites ontothe surface of a wheels, on the shaft g, to turn it and thereby give the feed. By this meansany degree of feed can be given, a thing 'which vcannot be effected bythe ratchet wheel for the teeth must be of a sufficient size to presentthe required strength,kand no feed can be given which is less than whatis due to one tooth, or more than one unless 1it be equal to two, and soon.A

The saw frame t, is properly'formed to receive the required number ofbladesor saws u. It is provided at or near the middle of its length withwrists 12,4), oneV on each side, to which are jointed connecting placeby screw bolts av a.

rods from a crank shaft adapted in manner well known-to give therequired range of motion. This saw frame -is provided with four wheelsm, x, w, which run on the ways as guides to the motion, and the track ofthe ways on which the wheels run are formed each of a plate of metal ybent in the middle to form a double inclined plane a, at the middle ofthe stroke of the saw frame for the purpose of lifting it up to let thesand and water run under the edges of the saws and then let down againwhile at or near its maximum speed. These plates are let into recessesin the ways and secured in And for the purpose of absorbing or reducingthe shock which the saw frame would experience when the wheels come inContact with the inclined lries of strokes.

' W'hat we claim as our invention, and desire to secure by LettersPatent in the saw-` on to the sand so as to make itacteiiciently.-

It will also be seent-hat whatever may be range of motion of the sawframe it will at every stroke receive the same lifting motion.

And that this lifting motion to permit the sand to pass under the edgesof thesaws,

takes place while the saw is at its maximum motion, so that when thesaws again descend,

freshV grains of sand are brought into action l that their sharp Vedgesmay act the betterA to break down the textureof the stone.V

vthe return motion from the end to themid dle, the grains of sand arerolled in the plans heretofore practiced they run in the same directionthe whole length of the stroke, and are then discharged by the lift'.

followed-up by a fresh supply. By'the arjrangementof the feed motion,which is susceptible of the finest adjustment, we are'enabled to givethe feed motionV for ,every stroke instead of one feed motion fora se#ing of marble and other stone, is' I l. Lifting the saws at orsufiiciently near the middle of the stroke to effect the vherein nerspecified.

2. We also claim interposing india-rubber or its equivalent between theways, and the inclined projections which lift the saw frame,substantially inthe manner and for the purpose specified.

JNO. T. BRUEN.` JAMES G. WILSON.

Witnesses to signature of J. T. Bruen:

CANsfrENY BRowNE, Y

ABEL `PORTER BROWN.

Witnesses to signature of J. G. Wilson:

C. W. VM. KELLER, ,ABEL PORTER BROWN.

